
//
// Authors:
//   Atsushi Enomoto
//
// Copyright 2007 Novell (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0

using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml;

namespace System.Xml.Linq
{

	public abstract class XObject : IXmlLineInfo
	{

		internal XObject()
		{
		}
		XContainer owner;
		List<object> annotations;
		string baseuri;
		int line, column;

		public event EventHandler<XObjectChangeEventArgs> Changing;
		public event EventHandler<XObjectChangeEventArgs> Changed;
		public string BaseUri
		{
			get { return baseuri; }

			internal set { baseuri = value; }
		}

		public XDocument Document
		{
			get
			{
				if (this is XDocument)
					return (XDocument)this;

				for (XContainer e = owner; e != null; e = e.owner)
					if (e is XDocument)
						return (XDocument)e;
				return null;
			}
		}

		public abstract XmlNodeType NodeType { get; }
		public XElement Parent
		{
			get { return owner as XElement; }
		}

		internal XContainer Owner
		{
			get { return owner; }
		}

		internal void SetOwner(XContainer node)
		{
			owner = node;
		}

		public void AddAnnotation(object annotation)
		{
			if (annotation == null)
				throw new ArgumentNullException("annotation");
			if (annotations == null)
				annotations = new List<object>();
			annotations.Add(annotation);
		}

		public T Annotation<T>() where T : class
		{
			return (T)Annotation(typeof(T));
		}

		public object Annotation(Type type)
		{
			return Annotations(type).FirstOrDefault();
		}

		public IEnumerable<T> Annotations<T>() where T : class
		{

			foreach (T o in Annotations(typeof(T)))
				yield return o;
		}

		public IEnumerable<object> Annotations(Type type)
		{
			if (type == null)
				throw new ArgumentNullException("type");
			if (annotations == null)
				yield break;

			foreach (object o in annotations)
				if (type.IsAssignableFrom(o.GetType()))
					yield return o;
		}

		public void RemoveAnnotations<T>() where T : class
		{
			RemoveAnnotations(typeof(T));
		}

		public void RemoveAnnotations(Type type)
		{
			if (annotations == null)
				return;

			for (int i = 0; i < annotations.Count; i++)
				if (type.IsAssignableFrom(annotations[i].GetType()))
					annotations.RemoveAt(i);
		}

		internal int LineNumber
		{
			get { return line; }
			set { line = value; }
		}

		internal int LinePosition
		{
			get { return column; }
			set { column = value; }
		}
		int IXmlLineInfo.LineNumber
		{
			get { return LineNumber; }
		}
		int IXmlLineInfo.LinePosition
		{
			get { return LinePosition; }
		}
		bool IXmlLineInfo.HasLineInfo()
		{
			return line > 0;
		}

		internal void FillLineInfoAndBaseUri(XmlReader r, LoadOptions options)
		{
			if ((options & LoadOptions.SetLineInfo) != LoadOptions.None)
			{
				IXmlLineInfo li = r as IXmlLineInfo;
				if (li != null && li.HasLineInfo())
				{
					LineNumber = li.LineNumber;
					LinePosition = li.LinePosition;
				}
			}
			if ((options & LoadOptions.SetBaseUri) != LoadOptions.None)
				BaseUri = r.BaseURI;
		}

		internal void OnAddingObject(object addedObject)
		{
			OnChanging(addedObject, new XObjectChangeEventArgs(XObjectChange.Add));
		}

		internal void OnAddedObject(object addedObject)
		{
			OnChanged(addedObject, new XObjectChangeEventArgs(XObjectChange.Add));
		}

		internal void OnNameChanging(object renamedObject)
		{
			OnChanging(renamedObject, new XObjectChangeEventArgs(System.Xml.Linq.XObjectChange.Name));
		}

		internal void OnNameChanged(object renamedObject)
		{
			OnChanged(renamedObject, new XObjectChangeEventArgs(System.Xml.Linq.XObjectChange.Name));
		}

		internal void OnRemovingObject(object removedObject)
		{
			OnChanging(removedObject, new XObjectChangeEventArgs(XObjectChange.Remove));
		}

		internal void OnRemovedObject(object removedObject)
		{
			OnChanged(removedObject, new XObjectChangeEventArgs(XObjectChange.Remove));
		}

		internal void OnValueChanging(object changedObject)
		{
			OnChanging(changedObject, new XObjectChangeEventArgs(XObjectChange.Value));
		}

		internal void OnValueChanged(object changedObject)
		{
			OnChanged(changedObject, new XObjectChangeEventArgs(XObjectChange.Value));
		}

		void OnChanging(object sender, XObjectChangeEventArgs args)
		{
			if (Changing != null)
				Changing(sender, args);
			if (Parent != null)
				Parent.OnChanging(sender, args);
		}

		void OnChanged(object sender, XObjectChangeEventArgs args)
		{
			if (Changed != null)
				Changed(sender, args);
			if (Parent != null)
				Parent.OnChanged(sender, args);
		}
	}
}

#endif